diff options
author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
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committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
tree | 10027f336435511475e392454359edea8e25895d /netwerk/sctp/src/netinet/sctp_cc_functions.c | |
parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
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Add m-esr52 at 52.6.0
Diffstat (limited to 'netwerk/sctp/src/netinet/sctp_cc_functions.c')
-rwxr-xr-x | netwerk/sctp/src/netinet/sctp_cc_functions.c | 2503 |
1 files changed, 2503 insertions, 0 deletions
diff --git a/netwerk/sctp/src/netinet/sctp_cc_functions.c b/netwerk/sctp/src/netinet/sctp_cc_functions.c new file mode 100755 index 000000000..0e01c9860 --- /dev/null +++ b/netwerk/sctp/src/netinet/sctp_cc_functions.c @@ -0,0 +1,2503 @@ +/*- + * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. + * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. + * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * a) Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * b) Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the distribution. + * + * c) Neither the name of Cisco Systems, Inc. nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF + * THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifdef __FreeBSD__ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: head/sys/netinet/sctp_cc_functions.c 279859 2015-03-10 19:49:25Z tuexen $"); +#endif + +#include <netinet/sctp_os.h> +#include <netinet/sctp_var.h> +#include <netinet/sctp_sysctl.h> +#include <netinet/sctp_pcb.h> +#include <netinet/sctp_header.h> +#include <netinet/sctputil.h> +#include <netinet/sctp_output.h> +#include <netinet/sctp_input.h> +#include <netinet/sctp_indata.h> +#include <netinet/sctp_uio.h> +#include <netinet/sctp_timer.h> +#include <netinet/sctp_auth.h> +#include <netinet/sctp_asconf.h> +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 +#include <netinet/sctp_dtrace_declare.h> +#endif + +#define SHIFT_MPTCP_MULTI_N 40 +#define SHIFT_MPTCP_MULTI_Z 16 +#define SHIFT_MPTCP_MULTI 8 + +static void +sctp_enforce_cwnd_limit(struct sctp_association *assoc, struct sctp_nets *net) +{ + if ((assoc->max_cwnd > 0) && + (net->cwnd > assoc->max_cwnd) && + (net->cwnd > (net->mtu - sizeof(struct sctphdr)))) { + net->cwnd = assoc->max_cwnd ; + if (net->cwnd < (net->mtu - sizeof(struct sctphdr))) { + net->cwnd = net->mtu - sizeof(struct sctphdr); + } + } +} + +static void +sctp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net) +{ + struct sctp_association *assoc; + uint32_t cwnd_in_mtu; + + assoc = &stcb->asoc; + cwnd_in_mtu = SCTP_BASE_SYSCTL(sctp_initial_cwnd); + if (cwnd_in_mtu == 0) { + /* Using 0 means that the value of RFC 4960 is used. */ + net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND)); + } else { + /* + * We take the minimum of the burst limit and the + * initial congestion window. + */ + if ((assoc->max_burst > 0) && (cwnd_in_mtu > assoc->max_burst)) + cwnd_in_mtu = assoc->max_burst; + net->cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu; + } + if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) || + (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2)) { + /* In case of resource pooling initialize appropriately */ + net->cwnd /= assoc->numnets; + if (net->cwnd < (net->mtu - sizeof(struct sctphdr))) { + net->cwnd = net->mtu - sizeof(struct sctphdr); + } + } + sctp_enforce_cwnd_limit(assoc, net); + net->ssthresh = assoc->peers_rwnd; +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + SDT_PROBE(sctp, cwnd, net, init, + stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net, + 0, net->cwnd); +#endif + if (SCTP_BASE_SYSCTL(sctp_logging_level) & + (SCTP_CWND_MONITOR_ENABLE|SCTP_CWND_LOGGING_ENABLE)) { + sctp_log_cwnd(stcb, net, 0, SCTP_CWND_INITIALIZATION); + } +} + +static void +sctp_cwnd_update_after_fr(struct sctp_tcb *stcb, + struct sctp_association *asoc) +{ + struct sctp_nets *net; + uint32_t t_ssthresh, t_cwnd; + uint64_t t_ucwnd_sbw; + + /* MT FIXME: Don't compute this over and over again */ + t_ssthresh = 0; + t_cwnd = 0; + t_ucwnd_sbw = 0; + if ((asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) || + (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2)) { + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + t_ssthresh += net->ssthresh; + t_cwnd += net->cwnd; + if (net->lastsa > 0) { + t_ucwnd_sbw += (uint64_t)net->cwnd / (uint64_t)net->lastsa; + } + } + if (t_ucwnd_sbw == 0) { + t_ucwnd_sbw = 1; + } + } + + /*- + * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) && + * (net->fast_retran_loss_recovery == 0))) + */ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + if ((asoc->fast_retran_loss_recovery == 0) || + (asoc->sctp_cmt_on_off > 0)) { + /* out of a RFC2582 Fast recovery window? */ + if (net->net_ack > 0) { + /* + * per section 7.2.3, are there any + * destinations that had a fast retransmit + * to them. If so what we need to do is + * adjust ssthresh and cwnd. + */ + struct sctp_tmit_chunk *lchk; + int old_cwnd = net->cwnd; + + if ((asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) || + (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2)) { + if (asoc->sctp_cmt_on_off == SCTP_CMT_RPV1) { + net->ssthresh = (uint32_t)(((uint64_t)4 * + (uint64_t)net->mtu * + (uint64_t)net->ssthresh) / + (uint64_t)t_ssthresh); + + } + if (asoc->sctp_cmt_on_off == SCTP_CMT_RPV2) { + uint32_t srtt; + + srtt = net->lastsa; + /* lastsa>>3; we don't need to devide ...*/ + if (srtt == 0) { + srtt = 1; + } + /* Short Version => Equal to Contel Version MBe */ + net->ssthresh = (uint32_t) (((uint64_t)4 * + (uint64_t)net->mtu * + (uint64_t)net->cwnd) / + ((uint64_t)srtt * + t_ucwnd_sbw)); + /* INCREASE FACTOR */; + } + if ((net->cwnd > t_cwnd / 2) && + (net->ssthresh < net->cwnd - t_cwnd / 2)) { + net->ssthresh = net->cwnd - t_cwnd / 2; + } + if (net->ssthresh < net->mtu) { + net->ssthresh = net->mtu; + } + } else { + net->ssthresh = net->cwnd / 2; + if (net->ssthresh < (net->mtu * 2)) { + net->ssthresh = 2 * net->mtu; + } + } + net->cwnd = net->ssthresh; + sctp_enforce_cwnd_limit(asoc, net); +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + SDT_PROBE(sctp, cwnd, net, fr, + stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net, + old_cwnd, net->cwnd); +#endif + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), + SCTP_CWND_LOG_FROM_FR); + } + lchk = TAILQ_FIRST(&asoc->send_queue); + + net->partial_bytes_acked = 0; + /* Turn on fast recovery window */ + asoc->fast_retran_loss_recovery = 1; + if (lchk == NULL) { + /* Mark end of the window */ + asoc->fast_recovery_tsn = asoc->sending_seq - 1; + } else { + asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; + } + + /* + * CMT fast recovery -- per destination + * recovery variable. + */ + net->fast_retran_loss_recovery = 1; + + if (lchk == NULL) { + /* Mark end of the window */ + net->fast_recovery_tsn = asoc->sending_seq - 1; + } else { + net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; + } + + sctp_timer_stop(SCTP_TIMER_TYPE_SEND, + stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA+SCTP_LOC_32 ); + sctp_timer_start(SCTP_TIMER_TYPE_SEND, + stcb->sctp_ep, stcb, net); + } + } else if (net->net_ack > 0) { + /* + * Mark a peg that we WOULD have done a cwnd + * reduction but RFC2582 prevented this action. + */ + SCTP_STAT_INCR(sctps_fastretransinrtt); + } + } +} + +/* Defines for instantaneous bw decisions */ +#define SCTP_INST_LOOSING 1 /* Loosing to other flows */ +#define SCTP_INST_NEUTRAL 2 /* Neutral, no indication */ +#define SCTP_INST_GAINING 3 /* Gaining, step down possible */ + + +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 +static int +cc_bw_same(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw, + uint64_t rtt_offset, uint64_t vtag, uint8_t inst_ind) +#else +static int +cc_bw_same(struct sctp_tcb *stcb SCTP_UNUSED, struct sctp_nets *net, uint64_t nbw, + uint64_t rtt_offset, uint8_t inst_ind) +#endif +{ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + uint64_t oth, probepoint; +#endif + +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + probepoint = (((uint64_t)net->cwnd) << 32); +#endif + if (net->rtt > net->cc_mod.rtcc.lbw_rtt + rtt_offset) { + /* + * rtt increased + * we don't update bw.. so we don't + * update the rtt either. + */ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + /* Probe point 5 */ + probepoint |= ((5 << 16) | 1); + SDT_PROBE(sctp, cwnd, net, rttvar, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + net->flight_size, + probepoint); +#endif + if ((net->cc_mod.rtcc.steady_step) && (inst_ind != SCTP_INST_LOOSING)) { + if (net->cc_mod.rtcc.last_step_state == 5) + net->cc_mod.rtcc.step_cnt++; + else + net->cc_mod.rtcc.step_cnt = 1; + net->cc_mod.rtcc.last_step_state = 5; + if ((net->cc_mod.rtcc.step_cnt == net->cc_mod.rtcc.steady_step) || + ((net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step) && + ((net->cc_mod.rtcc.step_cnt % net->cc_mod.rtcc.steady_step) == 0))) { + /* Try a step down */ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + oth = net->cc_mod.rtcc.vol_reduce; + oth <<= 16; + oth |= net->cc_mod.rtcc.step_cnt; + oth <<= 16; + oth |= net->cc_mod.rtcc.last_step_state; + SDT_PROBE(sctp, cwnd, net, rttstep, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + oth, + probepoint); +#endif + if (net->cwnd > (4 * net->mtu)) { + net->cwnd -= net->mtu; + net->cc_mod.rtcc.vol_reduce++; + } else { + net->cc_mod.rtcc.step_cnt = 0; + } + } + } + return (1); + } + if (net->rtt < net->cc_mod.rtcc.lbw_rtt-rtt_offset) { + /* + * rtt decreased, there could be more room. + * we update both the bw and the rtt here to + * lock this in as a good step down. + */ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + /* Probe point 6 */ + probepoint |= ((6 << 16) | 0); + SDT_PROBE(sctp, cwnd, net, rttvar, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + net->flight_size, + probepoint); +#endif + if (net->cc_mod.rtcc.steady_step) { +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + oth = net->cc_mod.rtcc.vol_reduce; + oth <<= 16; + oth |= net->cc_mod.rtcc.step_cnt; + oth <<= 16; + oth |= net->cc_mod.rtcc.last_step_state; + SDT_PROBE(sctp, cwnd, net, rttstep, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + oth, + probepoint); +#endif + if ((net->cc_mod.rtcc.last_step_state == 5) && + (net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step)) { + /* Step down worked */ + net->cc_mod.rtcc.step_cnt = 0; + return (1); + } else { + net->cc_mod.rtcc.last_step_state = 6; + net->cc_mod.rtcc.step_cnt = 0; + } + } + net->cc_mod.rtcc.lbw = nbw; + net->cc_mod.rtcc.lbw_rtt = net->rtt; + net->cc_mod.rtcc.cwnd_at_bw_set = net->cwnd; + if (inst_ind == SCTP_INST_GAINING) + return (1); + else if (inst_ind == SCTP_INST_NEUTRAL) + return (1); + else + return (0); + } + /* Ok bw and rtt remained the same .. no update to any + */ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + /* Probe point 7 */ + probepoint |= ((7 << 16) | net->cc_mod.rtcc.ret_from_eq); + SDT_PROBE(sctp, cwnd, net, rttvar, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + net->flight_size, + probepoint); +#endif + if ((net->cc_mod.rtcc.steady_step) && (inst_ind != SCTP_INST_LOOSING)) { + if (net->cc_mod.rtcc.last_step_state == 5) + net->cc_mod.rtcc.step_cnt++; + else + net->cc_mod.rtcc.step_cnt = 1; + net->cc_mod.rtcc.last_step_state = 5; + if ((net->cc_mod.rtcc.step_cnt == net->cc_mod.rtcc.steady_step) || + ((net->cc_mod.rtcc.step_cnt > net->cc_mod.rtcc.steady_step) && + ((net->cc_mod.rtcc.step_cnt % net->cc_mod.rtcc.steady_step) == 0))) { + /* Try a step down */ + if (net->cwnd > (4 * net->mtu)) { + net->cwnd -= net->mtu; + net->cc_mod.rtcc.vol_reduce++; + return (1); + } else { + net->cc_mod.rtcc.step_cnt = 0; + } + } + } + if (inst_ind == SCTP_INST_GAINING) + return (1); + else if (inst_ind == SCTP_INST_NEUTRAL) + return (1); + else + return ((int)net->cc_mod.rtcc.ret_from_eq); +} + +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 +static int +cc_bw_decrease(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw, uint64_t rtt_offset, + uint64_t vtag, uint8_t inst_ind) +#else +static int +cc_bw_decrease(struct sctp_tcb *stcb SCTP_UNUSED, struct sctp_nets *net, uint64_t nbw, uint64_t rtt_offset, + uint8_t inst_ind) +#endif +{ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + uint64_t oth, probepoint; +#endif + + /* Bandwidth decreased.*/ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + probepoint = (((uint64_t)net->cwnd) << 32); +#endif + if (net->rtt > net->cc_mod.rtcc.lbw_rtt+rtt_offset) { + /* rtt increased */ + /* Did we add more */ + if ((net->cwnd > net->cc_mod.rtcc.cwnd_at_bw_set) && + (inst_ind != SCTP_INST_LOOSING)) { + /* We caused it maybe.. back off? */ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + /* PROBE POINT 1 */ + probepoint |= ((1 << 16) | 1); + SDT_PROBE(sctp, cwnd, net, rttvar, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + net->flight_size, + probepoint); +#endif + if (net->cc_mod.rtcc.ret_from_eq) { + /* Switch over to CA if we are less aggressive */ + net->ssthresh = net->cwnd-1; + net->partial_bytes_acked = 0; + } + return (1); + } +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + /* Probe point 2 */ + probepoint |= ((2 << 16) | 0); + SDT_PROBE(sctp, cwnd, net, rttvar, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + net->flight_size, + probepoint); +#endif + /* Someone else - fight for more? */ + if (net->cc_mod.rtcc.steady_step) { +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + oth = net->cc_mod.rtcc.vol_reduce; + oth <<= 16; + oth |= net->cc_mod.rtcc.step_cnt; + oth <<= 16; + oth |= net->cc_mod.rtcc.last_step_state; + SDT_PROBE(sctp, cwnd, net, rttstep, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + oth, + probepoint); +#endif + /* Did we voluntarily give up some? if so take + * one back please + */ + if ((net->cc_mod.rtcc.vol_reduce) && + (inst_ind != SCTP_INST_GAINING)) { + net->cwnd += net->mtu; + sctp_enforce_cwnd_limit(&stcb->asoc, net); + net->cc_mod.rtcc.vol_reduce--; + } + net->cc_mod.rtcc.last_step_state = 2; + net->cc_mod.rtcc.step_cnt = 0; + } + goto out_decision; + } else if (net->rtt < net->cc_mod.rtcc.lbw_rtt-rtt_offset) { + /* bw & rtt decreased */ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + /* Probe point 3 */ + probepoint |= ((3 << 16) | 0); + SDT_PROBE(sctp, cwnd, net, rttvar, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + net->flight_size, + probepoint); +#endif + if (net->cc_mod.rtcc.steady_step) { +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + oth = net->cc_mod.rtcc.vol_reduce; + oth <<= 16; + oth |= net->cc_mod.rtcc.step_cnt; + oth <<= 16; + oth |= net->cc_mod.rtcc.last_step_state; + SDT_PROBE(sctp, cwnd, net, rttstep, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + oth, + probepoint); +#endif + if ((net->cc_mod.rtcc.vol_reduce) && + (inst_ind != SCTP_INST_GAINING)) { + net->cwnd += net->mtu; + sctp_enforce_cwnd_limit(&stcb->asoc, net); + net->cc_mod.rtcc.vol_reduce--; + } + net->cc_mod.rtcc.last_step_state = 3; + net->cc_mod.rtcc.step_cnt = 0; + } + goto out_decision; + } + /* The bw decreased but rtt stayed the same */ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + /* Probe point 4 */ + probepoint |= ((4 << 16) | 0); + SDT_PROBE(sctp, cwnd, net, rttvar, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + net->flight_size, + probepoint); +#endif + if (net->cc_mod.rtcc.steady_step) { +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + oth = net->cc_mod.rtcc.vol_reduce; + oth <<= 16; + oth |= net->cc_mod.rtcc.step_cnt; + oth <<= 16; + oth |= net->cc_mod.rtcc.last_step_state; + SDT_PROBE(sctp, cwnd, net, rttstep, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + oth, + probepoint); +#endif + if ((net->cc_mod.rtcc.vol_reduce) && + (inst_ind != SCTP_INST_GAINING)) { + net->cwnd += net->mtu; + sctp_enforce_cwnd_limit(&stcb->asoc, net); + net->cc_mod.rtcc.vol_reduce--; + } + net->cc_mod.rtcc.last_step_state = 4; + net->cc_mod.rtcc.step_cnt = 0; + } +out_decision: + net->cc_mod.rtcc.lbw = nbw; + net->cc_mod.rtcc.lbw_rtt = net->rtt; + net->cc_mod.rtcc.cwnd_at_bw_set = net->cwnd; + if (inst_ind == SCTP_INST_GAINING) { + return (1); + } else { + return (0); + } +} + +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 +static int +cc_bw_increase(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw, uint64_t vtag) +#else +static int +cc_bw_increase(struct sctp_tcb *stcb SCTP_UNUSED, struct sctp_nets *net, uint64_t nbw) +#endif +{ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + uint64_t oth, probepoint; + +#endif + /* BW increased, so update and + * return 0, since all actions in + * our table say to do the normal CC + * update. Note that we pay no attention to + * the inst_ind since our overall sum is increasing. + */ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + /* PROBE POINT 0 */ + probepoint = (((uint64_t)net->cwnd) << 32); + SDT_PROBE(sctp, cwnd, net, rttvar, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + net->flight_size, + probepoint); +#endif + if (net->cc_mod.rtcc.steady_step) { +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + oth = net->cc_mod.rtcc.vol_reduce; + oth <<= 16; + oth |= net->cc_mod.rtcc.step_cnt; + oth <<= 16; + oth |= net->cc_mod.rtcc.last_step_state; + SDT_PROBE(sctp, cwnd, net, rttstep, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | nbw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + oth, + probepoint); +#endif + net->cc_mod.rtcc.last_step_state = 0; + net->cc_mod.rtcc.step_cnt = 0; + net->cc_mod.rtcc.vol_reduce = 0; + } + net->cc_mod.rtcc.lbw = nbw; + net->cc_mod.rtcc.lbw_rtt = net->rtt; + net->cc_mod.rtcc.cwnd_at_bw_set = net->cwnd; + return (0); +} + +/* RTCC Algoritm to limit growth of cwnd, return + * true if you want to NOT allow cwnd growth + */ +static int +cc_bw_limit(struct sctp_tcb *stcb, struct sctp_nets *net, uint64_t nbw) +{ + uint64_t bw_offset, rtt_offset; +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + uint64_t probepoint, rtt, vtag; +#endif + uint64_t bytes_for_this_rtt, inst_bw; + uint64_t div, inst_off; + int bw_shift; + uint8_t inst_ind; + int ret; + /*- + * Here we need to see if we want + * to limit cwnd growth due to increase + * in overall rtt but no increase in bw. + * We use the following table to figure + * out what we should do. When we return + * 0, cc update goes on as planned. If we + * return 1, then no cc update happens and cwnd + * stays where it is at. + * ---------------------------------- + * BW | RTT | Action + * ********************************* + * INC | INC | return 0 + * ---------------------------------- + * INC | SAME | return 0 + * ---------------------------------- + * INC | DECR | return 0 + * ---------------------------------- + * SAME | INC | return 1 + * ---------------------------------- + * SAME | SAME | return 1 + * ---------------------------------- + * SAME | DECR | return 0 + * ---------------------------------- + * DECR | INC | return 0 or 1 based on if we caused. + * ---------------------------------- + * DECR | SAME | return 0 + * ---------------------------------- + * DECR | DECR | return 0 + * ---------------------------------- + * + * We are a bit fuzz on what an increase or + * decrease is. For BW it is the same if + * it did not change within 1/64th. For + * RTT it stayed the same if it did not + * change within 1/32nd + */ + bw_shift = SCTP_BASE_SYSCTL(sctp_rttvar_bw); +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + rtt = stcb->asoc.my_vtag; + vtag = (rtt << 32) | (((uint32_t)(stcb->sctp_ep->sctp_lport)) << 16) | (stcb->rport); + probepoint = (((uint64_t)net->cwnd) << 32); + rtt = net->rtt; +#endif + if (net->cc_mod.rtcc.rtt_set_this_sack) { + net->cc_mod.rtcc.rtt_set_this_sack = 0; + bytes_for_this_rtt = net->cc_mod.rtcc.bw_bytes - net->cc_mod.rtcc.bw_bytes_at_last_rttc; + net->cc_mod.rtcc.bw_bytes_at_last_rttc = net->cc_mod.rtcc.bw_bytes; + if (net->rtt) { + div = net->rtt / 1000; + if (div) { + inst_bw = bytes_for_this_rtt / div; + inst_off = inst_bw >> bw_shift; + if (inst_bw > nbw) + inst_ind = SCTP_INST_GAINING; + else if ((inst_bw+inst_off) < nbw) + inst_ind = SCTP_INST_LOOSING; + else + inst_ind = SCTP_INST_NEUTRAL; +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + probepoint |= ((0xb << 16) | inst_ind); +#endif + } else { + inst_ind = net->cc_mod.rtcc.last_inst_ind; +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + inst_bw = bytes_for_this_rtt / (uint64_t)(net->rtt); + /* Can't determine do not change */ + probepoint |= ((0xc << 16) | inst_ind); +#endif + } + } else { + inst_ind = net->cc_mod.rtcc.last_inst_ind; +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + inst_bw = bytes_for_this_rtt; + /* Can't determine do not change */ + probepoint |= ((0xd << 16) | inst_ind); +#endif + } +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + SDT_PROBE(sctp, cwnd, net, rttvar, + vtag, + ((nbw << 32) | inst_bw), + ((net->cc_mod.rtcc.lbw_rtt << 32) | rtt), + net->flight_size, + probepoint); +#endif + } else { + /* No rtt measurement, use last one */ + inst_ind = net->cc_mod.rtcc.last_inst_ind; + } + bw_offset = net->cc_mod.rtcc.lbw >> bw_shift; + if (nbw > net->cc_mod.rtcc.lbw + bw_offset) { +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + ret = cc_bw_increase(stcb, net, nbw, vtag); +#else + ret = cc_bw_increase(stcb, net, nbw); +#endif + goto out; + } + rtt_offset = net->cc_mod.rtcc.lbw_rtt >> SCTP_BASE_SYSCTL(sctp_rttvar_rtt); + if (nbw < net->cc_mod.rtcc.lbw - bw_offset) { +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + ret = cc_bw_decrease(stcb, net, nbw, rtt_offset, vtag, inst_ind); +#else + ret = cc_bw_decrease(stcb, net, nbw, rtt_offset, inst_ind); +#endif + goto out; + } + /* If we reach here then + * we are in a situation where + * the bw stayed the same. + */ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + ret = cc_bw_same(stcb, net, nbw, rtt_offset, vtag, inst_ind); +#else + ret = cc_bw_same(stcb, net, nbw, rtt_offset, inst_ind); +#endif +out: + net->cc_mod.rtcc.last_inst_ind = inst_ind; + return (ret); +} + +static void +sctp_cwnd_update_after_sack_common(struct sctp_tcb *stcb, + struct sctp_association *asoc, + int accum_moved, int reneged_all SCTP_UNUSED, int will_exit, int use_rtcc) +{ + struct sctp_nets *net; +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + int old_cwnd; +#endif + uint32_t t_ssthresh, t_cwnd, incr; + uint64_t t_ucwnd_sbw; + uint64_t t_path_mptcp; + uint64_t mptcp_like_alpha; + uint32_t srtt; + uint64_t max_path; + + /* MT FIXME: Don't compute this over and over again */ + t_ssthresh = 0; + t_cwnd = 0; + t_ucwnd_sbw = 0; + t_path_mptcp = 0; + mptcp_like_alpha = 1; + if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) || + (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2) || + (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_MPTCP)) { + max_path = 0; + TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { + t_ssthresh += net->ssthresh; + t_cwnd += net->cwnd; + /* lastsa>>3; we don't need to devide ...*/ + srtt = net->lastsa; + if (srtt > 0) { + uint64_t tmp; + + t_ucwnd_sbw += (uint64_t)net->cwnd / (uint64_t)srtt; + t_path_mptcp += (((uint64_t)net->cwnd) << SHIFT_MPTCP_MULTI_Z) / + (((uint64_t)net->mtu) * (uint64_t)srtt); + tmp = (((uint64_t)net->cwnd) << SHIFT_MPTCP_MULTI_N) / + ((uint64_t)net->mtu * (uint64_t)(srtt * srtt)); + if (tmp > max_path) { + max_path = tmp; + } + } + } + if (t_path_mptcp > 0) { + mptcp_like_alpha = max_path / (t_path_mptcp * t_path_mptcp); + } else { + mptcp_like_alpha = 1; + } + } + if (t_ssthresh == 0) { + t_ssthresh = 1; + } + if (t_ucwnd_sbw == 0) { + t_ucwnd_sbw = 1; + } + /******************************/ + /* update cwnd and Early FR */ + /******************************/ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + +#ifdef JANA_CMT_FAST_RECOVERY + /* + * CMT fast recovery code. Need to debug. + */ + if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) { + if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) || + SCTP_TSN_GE(net->pseudo_cumack,net->fast_recovery_tsn)) { + net->will_exit_fast_recovery = 1; + } + } +#endif + /* if nothing was acked on this destination skip it */ + if (net->net_ack == 0) { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK); + } + continue; + } +#ifdef JANA_CMT_FAST_RECOVERY + /* CMT fast recovery code + */ + /* + if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery && net->will_exit_fast_recovery == 0) { + @@@ Do something + } + else if (sctp_cmt_on_off == 0 && asoc->fast_retran_loss_recovery && will_exit == 0) { + */ +#endif + + if (asoc->fast_retran_loss_recovery && + (will_exit == 0) && + (asoc->sctp_cmt_on_off == 0)) { + /* + * If we are in loss recovery we skip any cwnd + * update + */ + return; + } + /* + * Did any measurements go on for this network? + */ + if (use_rtcc && (net->cc_mod.rtcc.tls_needs_set > 0)) { + uint64_t nbw; + /* + * At this point our bw_bytes has been updated + * by incoming sack information. + * + * But our bw may not yet be set. + * + */ + if ((net->cc_mod.rtcc.new_tot_time/1000) > 0) { + nbw = net->cc_mod.rtcc.bw_bytes/(net->cc_mod.rtcc.new_tot_time/1000); + } else { + nbw = net->cc_mod.rtcc.bw_bytes; + } + if (net->cc_mod.rtcc.lbw) { + if (cc_bw_limit(stcb, net, nbw)) { + /* Hold here, no update */ + continue; + } + } else { +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + uint64_t vtag, probepoint; + + probepoint = (((uint64_t)net->cwnd) << 32); + probepoint |= ((0xa << 16) | 0); + vtag = (net->rtt << 32) | + (((uint32_t)(stcb->sctp_ep->sctp_lport)) << 16) | + (stcb->rport); + + SDT_PROBE(sctp, cwnd, net, rttvar, + vtag, + nbw, + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + net->flight_size, + probepoint); +#endif + net->cc_mod.rtcc.lbw = nbw; + net->cc_mod.rtcc.lbw_rtt = net->rtt; + if (net->cc_mod.rtcc.rtt_set_this_sack) { + net->cc_mod.rtcc.rtt_set_this_sack = 0; + net->cc_mod.rtcc.bw_bytes_at_last_rttc = net->cc_mod.rtcc.bw_bytes; + } + } + } + /* + * CMT: CUC algorithm. Update cwnd if pseudo-cumack has + * moved. + */ + if (accum_moved || + ((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) { + /* If the cumulative ack moved we can proceed */ + if (net->cwnd <= net->ssthresh) { + /* We are in slow start */ + if (net->flight_size + net->net_ack >= net->cwnd) { + uint32_t limit; + +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + old_cwnd = net->cwnd; +#endif + switch (asoc->sctp_cmt_on_off) { + case SCTP_CMT_RPV1: + limit = (uint32_t)(((uint64_t)net->mtu * + (uint64_t)SCTP_BASE_SYSCTL(sctp_L2_abc_variable) * + (uint64_t)net->ssthresh) / + (uint64_t)t_ssthresh); + incr = (uint32_t)(((uint64_t)net->net_ack * + (uint64_t)net->ssthresh) / + (uint64_t)t_ssthresh); + if (incr > limit) { + incr = limit; + } + if (incr == 0) { + incr = 1; + } + break; + case SCTP_CMT_RPV2: + /* lastsa>>3; we don't need to divide ...*/ + srtt = net->lastsa; + if (srtt == 0) { + srtt = 1; + } + limit = (uint32_t)(((uint64_t)net->mtu * + (uint64_t)SCTP_BASE_SYSCTL(sctp_L2_abc_variable) * + (uint64_t)net->cwnd) / + ((uint64_t)srtt * t_ucwnd_sbw)); + /* INCREASE FACTOR */ + incr = (uint32_t)(((uint64_t)net->net_ack * + (uint64_t)net->cwnd) / + ((uint64_t)srtt * t_ucwnd_sbw)); + /* INCREASE FACTOR */ + if (incr > limit) { + incr = limit; + } + if (incr == 0) { + incr = 1; + } + break; + case SCTP_CMT_MPTCP: + limit = (uint32_t)(((uint64_t)net->mtu * + mptcp_like_alpha * + (uint64_t)SCTP_BASE_SYSCTL(sctp_L2_abc_variable)) >> + SHIFT_MPTCP_MULTI); + incr = (uint32_t)(((uint64_t)net->net_ack * + mptcp_like_alpha) >> + SHIFT_MPTCP_MULTI); + if (incr > limit) { + incr = limit; + } + if (incr > net->net_ack) { + incr = net->net_ack; + } + if (incr > net->mtu) { + incr = net->mtu; + } + break; + default: + incr = net->net_ack; + if (incr > net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable)) { + incr = net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable); + } + break; + } + net->cwnd += incr; + sctp_enforce_cwnd_limit(asoc, net); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, incr, + SCTP_CWND_LOG_FROM_SS); + } +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + SDT_PROBE(sctp, cwnd, net, ack, + stcb->asoc.my_vtag, + ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), + net, + old_cwnd, net->cwnd); +#endif + } else { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, net, net->net_ack, + SCTP_CWND_LOG_NOADV_SS); + } + } + } else { + /* We are in congestion avoidance */ + /* + * Add to pba + */ + net->partial_bytes_acked += net->net_ack; + + if ((net->flight_size + net->net_ack >= net->cwnd) && + (net->partial_bytes_acked >= net->cwnd)) { + net->partial_bytes_acked -= net->cwnd; +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + old_cwnd = net->cwnd; +#endif + switch (asoc->sctp_cmt_on_off) { + case SCTP_CMT_RPV1: + incr = (uint32_t)(((uint64_t)net->mtu * + (uint64_t)net->ssthresh) / + (uint64_t)t_ssthresh); + if (incr == 0) { + incr = 1; + } + break; + case SCTP_CMT_RPV2: + /* lastsa>>3; we don't need to divide ... */ + srtt = net->lastsa; + if (srtt == 0) { + srtt = 1; + } + incr = (uint32_t)((uint64_t)net->mtu * + (uint64_t)net->cwnd / + ((uint64_t)srtt * + t_ucwnd_sbw)); + /* INCREASE FACTOR */ + if (incr == 0) { + incr = 1; + } + break; + case SCTP_CMT_MPTCP: + incr = (uint32_t)((mptcp_like_alpha * + (uint64_t) net->cwnd) >> + SHIFT_MPTCP_MULTI); + if (incr > net->mtu) { + incr = net->mtu; + } + break; + default: + incr = net->mtu; + break; + } + net->cwnd += incr; + sctp_enforce_cwnd_limit(asoc, net); +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + SDT_PROBE(sctp, cwnd, net, ack, + stcb->asoc.my_vtag, + ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), + net, + old_cwnd, net->cwnd); +#endif + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, net->mtu, + SCTP_CWND_LOG_FROM_CA); + } + } else { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, net, net->net_ack, + SCTP_CWND_LOG_NOADV_CA); + } + } + } + } else { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, net, net->mtu, + SCTP_CWND_LOG_NO_CUMACK); + } + } + } +} + +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 +static void +sctp_cwnd_update_exit_pf_common(struct sctp_tcb *stcb, struct sctp_nets *net) +#else +static void +sctp_cwnd_update_exit_pf_common(struct sctp_tcb *stcb SCTP_UNUSED, struct sctp_nets *net) +#endif +{ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + int old_cwnd; + + old_cwnd = net->cwnd; +#endif + net->cwnd = net->mtu; +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + SDT_PROBE(sctp, cwnd, net, ack, + stcb->asoc.my_vtag, ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), net, + old_cwnd, net->cwnd); +#endif + SCTPDBG(SCTP_DEBUG_INDATA1, "Destination %p moved from PF to reachable with cwnd %d.\n", + (void *)net, net->cwnd); +} + + +static void +sctp_cwnd_update_after_timeout(struct sctp_tcb *stcb, struct sctp_nets *net) +{ + int old_cwnd = net->cwnd; + uint32_t t_ssthresh, t_cwnd; + uint64_t t_ucwnd_sbw; + + /* MT FIXME: Don't compute this over and over again */ + t_ssthresh = 0; + t_cwnd = 0; + if ((stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) || + (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV2)) { + struct sctp_nets *lnet; + uint32_t srtt; + + t_ucwnd_sbw = 0; + TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) { + t_ssthresh += lnet->ssthresh; + t_cwnd += lnet->cwnd; + srtt = lnet->lastsa; + /* lastsa>>3; we don't need to divide ... */ + if (srtt > 0) { + t_ucwnd_sbw += (uint64_t)lnet->cwnd / (uint64_t)srtt; + } + } + if (t_ssthresh < 1) { + t_ssthresh = 1; + } + if (t_ucwnd_sbw < 1) { + t_ucwnd_sbw = 1; + } + if (stcb->asoc.sctp_cmt_on_off == SCTP_CMT_RPV1) { + net->ssthresh = (uint32_t)(((uint64_t)4 * + (uint64_t)net->mtu * + (uint64_t)net->ssthresh) / + (uint64_t)t_ssthresh); + } else { + uint64_t cc_delta; + + srtt = net->lastsa; + /* lastsa>>3; we don't need to divide ... */ + if (srtt == 0) { + srtt = 1; + } + cc_delta = t_ucwnd_sbw * (uint64_t)srtt / 2; + if (cc_delta < t_cwnd) { + net->ssthresh = (uint32_t)((uint64_t)t_cwnd - cc_delta); + } else { + net->ssthresh = net->mtu; + } + } + if ((net->cwnd > t_cwnd / 2) && + (net->ssthresh < net->cwnd - t_cwnd / 2)) { + net->ssthresh = net->cwnd - t_cwnd / 2; + } + if (net->ssthresh < net->mtu) { + net->ssthresh = net->mtu; + } + } else { + net->ssthresh = max(net->cwnd / 2, 4 * net->mtu); + } + net->cwnd = net->mtu; + net->partial_bytes_acked = 0; +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + SDT_PROBE(sctp, cwnd, net, to, + stcb->asoc.my_vtag, + ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), + net, + old_cwnd, net->cwnd); +#endif + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX); + } +} + +static void +sctp_cwnd_update_after_ecn_echo_common(struct sctp_tcb *stcb, struct sctp_nets *net, + int in_window, int num_pkt_lost, int use_rtcc) +{ + int old_cwnd = net->cwnd; + if ((use_rtcc) && (net->lan_type == SCTP_LAN_LOCAL) && (net->cc_mod.rtcc.use_dccc_ecn)) { + /* Data center Congestion Control */ + if (in_window == 0) { + /* Go to CA with the cwnd at the point we sent + * the TSN that was marked with a CE. + */ + if (net->ecn_prev_cwnd < net->cwnd) { + /* Restore to prev cwnd */ + net->cwnd = net->ecn_prev_cwnd - (net->mtu * num_pkt_lost); + } else { + /* Just cut in 1/2 */ + net->cwnd /= 2; + } + /* Drop to CA */ + net->ssthresh = net->cwnd - (num_pkt_lost * net->mtu); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); + } + } else { + /* Further tuning down required over the drastic orginal cut */ + net->ssthresh -= (net->mtu * num_pkt_lost); + net->cwnd -= (net->mtu * num_pkt_lost); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); + } + + } + SCTP_STAT_INCR(sctps_ecnereducedcwnd); + } else { + if (in_window == 0) { + SCTP_STAT_INCR(sctps_ecnereducedcwnd); + net->ssthresh = net->cwnd / 2; + if (net->ssthresh < net->mtu) { + net->ssthresh = net->mtu; + /* here back off the timer as well, to slow us down */ + net->RTO <<= 1; + } + net->cwnd = net->ssthresh; +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + SDT_PROBE(sctp, cwnd, net, ecn, + stcb->asoc.my_vtag, + ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), + net, + old_cwnd, net->cwnd); +#endif + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); + } + } + } + +} + +static void +sctp_cwnd_update_after_packet_dropped(struct sctp_tcb *stcb, + struct sctp_nets *net, struct sctp_pktdrop_chunk *cp, + uint32_t *bottle_bw, uint32_t *on_queue) +{ + uint32_t bw_avail; + unsigned int incr; + int old_cwnd = net->cwnd; + + /* get bottle neck bw */ + *bottle_bw = ntohl(cp->bottle_bw); + /* and whats on queue */ + *on_queue = ntohl(cp->current_onq); + /* + * adjust the on-queue if our flight is more it could be + * that the router has not yet gotten data "in-flight" to it + */ + if (*on_queue < net->flight_size) { + *on_queue = net->flight_size; + } + /* rtt is measured in micro seconds, bottle_bw in bytes per second */ + bw_avail = (uint32_t)(((uint64_t)(*bottle_bw) * net->rtt) / (uint64_t)1000000); + if (bw_avail > *bottle_bw) { + /* + * Cap the growth to no more than the bottle neck. + * This can happen as RTT slides up due to queues. + * It also means if you have more than a 1 second + * RTT with a empty queue you will be limited to the + * bottle_bw per second no matter if other points + * have 1/2 the RTT and you could get more out... + */ + bw_avail = *bottle_bw; + } + if (*on_queue > bw_avail) { + /* + * No room for anything else don't allow anything + * else to be "added to the fire". + */ + int seg_inflight, seg_onqueue, my_portion; + + net->partial_bytes_acked = 0; + /* how much are we over queue size? */ + incr = *on_queue - bw_avail; + if (stcb->asoc.seen_a_sack_this_pkt) { + /* + * undo any cwnd adjustment that the sack + * might have made + */ + net->cwnd = net->prev_cwnd; + } + /* Now how much of that is mine? */ + seg_inflight = net->flight_size / net->mtu; + seg_onqueue = *on_queue / net->mtu; + my_portion = (incr * seg_inflight) / seg_onqueue; + + /* Have I made an adjustment already */ + if (net->cwnd > net->flight_size) { + /* + * for this flight I made an adjustment we + * need to decrease the portion by a share + * our previous adjustment. + */ + int diff_adj; + + diff_adj = net->cwnd - net->flight_size; + if (diff_adj > my_portion) + my_portion = 0; + else + my_portion -= diff_adj; + } + /* + * back down to the previous cwnd (assume we have + * had a sack before this packet). minus what ever + * portion of the overage is my fault. + */ + net->cwnd -= my_portion; + + /* we will NOT back down more than 1 MTU */ + if (net->cwnd <= net->mtu) { + net->cwnd = net->mtu; + } + /* force into CA */ + net->ssthresh = net->cwnd - 1; + } else { + /* + * Take 1/4 of the space left or max burst up .. + * whichever is less. + */ + incr = (bw_avail - *on_queue) >> 2; + if ((stcb->asoc.max_burst > 0) && + (stcb->asoc.max_burst * net->mtu < incr)) { + incr = stcb->asoc.max_burst * net->mtu; + } + net->cwnd += incr; + } + if (net->cwnd > bw_avail) { + /* We can't exceed the pipe size */ + net->cwnd = bw_avail; + } + if (net->cwnd < net->mtu) { + /* We always have 1 MTU */ + net->cwnd = net->mtu; + } + sctp_enforce_cwnd_limit(&stcb->asoc, net); + if (net->cwnd - old_cwnd != 0) { + /* log only changes */ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + SDT_PROBE(sctp, cwnd, net, pd, + stcb->asoc.my_vtag, + ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), + net, + old_cwnd, net->cwnd); +#endif + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), + SCTP_CWND_LOG_FROM_SAT); + } + } +} + +static void +sctp_cwnd_update_after_output(struct sctp_tcb *stcb, + struct sctp_nets *net, int burst_limit) +{ + int old_cwnd = net->cwnd; + + if (net->ssthresh < net->cwnd) + net->ssthresh = net->cwnd; + if (burst_limit) { + net->cwnd = (net->flight_size + (burst_limit * net->mtu)); + sctp_enforce_cwnd_limit(&stcb->asoc, net); +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + SDT_PROBE(sctp, cwnd, net, bl, + stcb->asoc.my_vtag, + ((stcb->sctp_ep->sctp_lport << 16) | (stcb->rport)), + net, + old_cwnd, net->cwnd); +#endif + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_BRST); + } + } +} + +static void +sctp_cwnd_update_after_sack(struct sctp_tcb *stcb, + struct sctp_association *asoc, + int accum_moved, int reneged_all, int will_exit) +{ + /* Passing a zero argument in last disables the rtcc algoritm */ + sctp_cwnd_update_after_sack_common(stcb, asoc, accum_moved, reneged_all, will_exit, 0); +} + +static void +sctp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net, + int in_window, int num_pkt_lost) +{ + /* Passing a zero argument in last disables the rtcc algoritm */ + sctp_cwnd_update_after_ecn_echo_common(stcb, net, in_window, num_pkt_lost, 0); +} + +/* Here starts the RTCCVAR type CC invented by RRS which + * is a slight mod to RFC2581. We reuse a common routine or + * two since these algoritms are so close and need to + * remain the same. + */ +static void +sctp_cwnd_update_rtcc_after_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net, + int in_window, int num_pkt_lost) +{ + sctp_cwnd_update_after_ecn_echo_common(stcb, net, in_window, num_pkt_lost, 1); +} + + +static +void sctp_cwnd_update_rtcc_tsn_acknowledged(struct sctp_nets *net, + struct sctp_tmit_chunk *tp1) +{ + net->cc_mod.rtcc.bw_bytes += tp1->send_size; +} + +static void +sctp_cwnd_prepare_rtcc_net_for_sack(struct sctp_tcb *stcb SCTP_UNUSED, + struct sctp_nets *net) +{ + if (net->cc_mod.rtcc.tls_needs_set > 0) { + /* We had a bw measurment going on */ + struct timeval ltls; + SCTP_GETPTIME_TIMEVAL(<ls); + timevalsub(<ls, &net->cc_mod.rtcc.tls); + net->cc_mod.rtcc.new_tot_time = (ltls.tv_sec * 1000000) + ltls.tv_usec; + } +} + +static void +sctp_cwnd_new_rtcc_transmission_begins(struct sctp_tcb *stcb, + struct sctp_nets *net) +{ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + uint64_t vtag, probepoint; + +#endif + if (net->cc_mod.rtcc.lbw) { +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + /* Clear the old bw.. we went to 0 in-flight */ + vtag = (net->rtt << 32) | (((uint32_t)(stcb->sctp_ep->sctp_lport)) << 16) | + (stcb->rport); + probepoint = (((uint64_t)net->cwnd) << 32); + /* Probe point 8 */ + probepoint |= ((8 << 16) | 0); + SDT_PROBE(sctp, cwnd, net, rttvar, + vtag, + ((net->cc_mod.rtcc.lbw << 32) | 0), + ((net->cc_mod.rtcc.lbw_rtt << 32) | net->rtt), + net->flight_size, + probepoint); +#endif + net->cc_mod.rtcc.lbw_rtt = 0; + net->cc_mod.rtcc.cwnd_at_bw_set = 0; + net->cc_mod.rtcc.lbw = 0; + net->cc_mod.rtcc.bw_bytes_at_last_rttc = 0; + net->cc_mod.rtcc.vol_reduce = 0; + net->cc_mod.rtcc.bw_tot_time = 0; + net->cc_mod.rtcc.bw_bytes = 0; + net->cc_mod.rtcc.tls_needs_set = 0; + if (net->cc_mod.rtcc.steady_step) { + net->cc_mod.rtcc.vol_reduce = 0; + net->cc_mod.rtcc.step_cnt = 0; + net->cc_mod.rtcc.last_step_state = 0; + } + if (net->cc_mod.rtcc.ret_from_eq) { + /* less aggressive one - reset cwnd too */ + uint32_t cwnd_in_mtu, cwnd; + + cwnd_in_mtu = SCTP_BASE_SYSCTL(sctp_initial_cwnd); + if (cwnd_in_mtu == 0) { + /* Using 0 means that the value of RFC 4960 is used. */ + cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND)); + } else { + /* + * We take the minimum of the burst limit and the + * initial congestion window. + */ + if ((stcb->asoc.max_burst > 0) && (cwnd_in_mtu > stcb->asoc.max_burst)) + cwnd_in_mtu = stcb->asoc.max_burst; + cwnd = (net->mtu - sizeof(struct sctphdr)) * cwnd_in_mtu; + } + if (net->cwnd > cwnd) { + /* Only set if we are not a timeout (i.e. down to 1 mtu) */ + net->cwnd = cwnd; + } + } + } +} + +static void +sctp_set_rtcc_initial_cc_param(struct sctp_tcb *stcb, + struct sctp_nets *net) +{ +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + uint64_t vtag, probepoint; + +#endif + sctp_set_initial_cc_param(stcb, net); + stcb->asoc.use_precise_time = 1; +#if defined(__FreeBSD__) && __FreeBSD_version >= 803000 + probepoint = (((uint64_t)net->cwnd) << 32); + probepoint |= ((9 << 16) | 0); + vtag = (net->rtt << 32) | + (((uint32_t)(stcb->sctp_ep->sctp_lport)) << 16) | + (stcb->rport); + SDT_PROBE(sctp, cwnd, net, rttvar, + vtag, + 0, + 0, + 0, + probepoint); +#endif + net->cc_mod.rtcc.lbw_rtt = 0; + net->cc_mod.rtcc.cwnd_at_bw_set = 0; + net->cc_mod.rtcc.vol_reduce = 0; + net->cc_mod.rtcc.lbw = 0; + net->cc_mod.rtcc.vol_reduce = 0; + net->cc_mod.rtcc.bw_bytes_at_last_rttc = 0; + net->cc_mod.rtcc.bw_tot_time = 0; + net->cc_mod.rtcc.bw_bytes = 0; + net->cc_mod.rtcc.tls_needs_set = 0; + net->cc_mod.rtcc.ret_from_eq = SCTP_BASE_SYSCTL(sctp_rttvar_eqret); + net->cc_mod.rtcc.steady_step = SCTP_BASE_SYSCTL(sctp_steady_step); + net->cc_mod.rtcc.use_dccc_ecn = SCTP_BASE_SYSCTL(sctp_use_dccc_ecn); + net->cc_mod.rtcc.step_cnt = 0; + net->cc_mod.rtcc.last_step_state = 0; + + +} + +static int +sctp_cwnd_rtcc_socket_option(struct sctp_tcb *stcb, int setorget, + struct sctp_cc_option *cc_opt) +{ + struct sctp_nets *net; + if (setorget == 1) { + /* a set */ + if (cc_opt->option == SCTP_CC_OPT_RTCC_SETMODE) { + if ((cc_opt->aid_value.assoc_value != 0) && + (cc_opt->aid_value.assoc_value != 1)) { + return (EINVAL); + } + TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { + net->cc_mod.rtcc.ret_from_eq = cc_opt->aid_value.assoc_value; + } + } else if (cc_opt->option == SCTP_CC_OPT_USE_DCCC_ECN) { + if ((cc_opt->aid_value.assoc_value != 0) && + (cc_opt->aid_value.assoc_value != 1)) { + return (EINVAL); + } + TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { + net->cc_mod.rtcc.use_dccc_ecn = cc_opt->aid_value.assoc_value; + } + } else if (cc_opt->option == SCTP_CC_OPT_STEADY_STEP) { + TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { + net->cc_mod.rtcc.steady_step = cc_opt->aid_value.assoc_value; + } + } else { + return (EINVAL); + } + } else { + /* a get */ + if (cc_opt->option == SCTP_CC_OPT_RTCC_SETMODE) { + net = TAILQ_FIRST(&stcb->asoc.nets); + if (net == NULL) { + return (EFAULT); + } + cc_opt->aid_value.assoc_value = net->cc_mod.rtcc.ret_from_eq; + } else if (cc_opt->option == SCTP_CC_OPT_USE_DCCC_ECN) { + net = TAILQ_FIRST(&stcb->asoc.nets); + if (net == NULL) { + return (EFAULT); + } + cc_opt->aid_value.assoc_value = net->cc_mod.rtcc.use_dccc_ecn; + } else if (cc_opt->option == SCTP_CC_OPT_STEADY_STEP) { + net = TAILQ_FIRST(&stcb->asoc.nets); + if (net == NULL) { + return (EFAULT); + } + cc_opt->aid_value.assoc_value = net->cc_mod.rtcc.steady_step; + } else { + return (EINVAL); + } + } + return (0); +} + +static void +sctp_cwnd_update_rtcc_packet_transmitted(struct sctp_tcb *stcb SCTP_UNUSED, + struct sctp_nets *net) +{ + if (net->cc_mod.rtcc.tls_needs_set == 0) { + SCTP_GETPTIME_TIMEVAL(&net->cc_mod.rtcc.tls); + net->cc_mod.rtcc.tls_needs_set = 2; + } +} + +static void +sctp_cwnd_update_rtcc_after_sack(struct sctp_tcb *stcb, + struct sctp_association *asoc, + int accum_moved, int reneged_all, int will_exit) +{ + /* Passing a one argument at the last enables the rtcc algoritm */ + sctp_cwnd_update_after_sack_common(stcb, asoc, accum_moved, reneged_all, will_exit, 1); +} + +static void +sctp_rtt_rtcc_calculated(struct sctp_tcb *stcb SCTP_UNUSED, + struct sctp_nets *net, + struct timeval *now SCTP_UNUSED) +{ + net->cc_mod.rtcc.rtt_set_this_sack = 1; +} + +/* Here starts Sally Floyds HS-TCP */ + +struct sctp_hs_raise_drop { + int32_t cwnd; + int32_t increase; + int32_t drop_percent; +}; + +#define SCTP_HS_TABLE_SIZE 73 + +struct sctp_hs_raise_drop sctp_cwnd_adjust[SCTP_HS_TABLE_SIZE] = { + {38, 1, 50}, /* 0 */ + {118, 2, 44}, /* 1 */ + {221, 3, 41}, /* 2 */ + {347, 4, 38}, /* 3 */ + {495, 5, 37}, /* 4 */ + {663, 6, 35}, /* 5 */ + {851, 7, 34}, /* 6 */ + {1058, 8, 33}, /* 7 */ + {1284, 9, 32}, /* 8 */ + {1529, 10, 31}, /* 9 */ + {1793, 11, 30}, /* 10 */ + {2076, 12, 29}, /* 11 */ + {2378, 13, 28}, /* 12 */ + {2699, 14, 28}, /* 13 */ + {3039, 15, 27}, /* 14 */ + {3399, 16, 27}, /* 15 */ + {3778, 17, 26}, /* 16 */ + {4177, 18, 26}, /* 17 */ + {4596, 19, 25}, /* 18 */ + {5036, 20, 25}, /* 19 */ + {5497, 21, 24}, /* 20 */ + {5979, 22, 24}, /* 21 */ + {6483, 23, 23}, /* 22 */ + {7009, 24, 23}, /* 23 */ + {7558, 25, 22}, /* 24 */ + {8130, 26, 22}, /* 25 */ + {8726, 27, 22}, /* 26 */ + {9346, 28, 21}, /* 27 */ + {9991, 29, 21}, /* 28 */ + {10661, 30, 21}, /* 29 */ + {11358, 31, 20}, /* 30 */ + {12082, 32, 20}, /* 31 */ + {12834, 33, 20}, /* 32 */ + {13614, 34, 19}, /* 33 */ + {14424, 35, 19}, /* 34 */ + {15265, 36, 19}, /* 35 */ + {16137, 37, 19}, /* 36 */ + {17042, 38, 18}, /* 37 */ + {17981, 39, 18}, /* 38 */ + {18955, 40, 18}, /* 39 */ + {19965, 41, 17}, /* 40 */ + {21013, 42, 17}, /* 41 */ + {22101, 43, 17}, /* 42 */ + {23230, 44, 17}, /* 43 */ + {24402, 45, 16}, /* 44 */ + {25618, 46, 16}, /* 45 */ + {26881, 47, 16}, /* 46 */ + {28193, 48, 16}, /* 47 */ + {29557, 49, 15}, /* 48 */ + {30975, 50, 15}, /* 49 */ + {32450, 51, 15}, /* 50 */ + {33986, 52, 15}, /* 51 */ + {35586, 53, 14}, /* 52 */ + {37253, 54, 14}, /* 53 */ + {38992, 55, 14}, /* 54 */ + {40808, 56, 14}, /* 55 */ + {42707, 57, 13}, /* 56 */ + {44694, 58, 13}, /* 57 */ + {46776, 59, 13}, /* 58 */ + {48961, 60, 13}, /* 59 */ + {51258, 61, 13}, /* 60 */ + {53677, 62, 12}, /* 61 */ + {56230, 63, 12}, /* 62 */ + {58932, 64, 12}, /* 63 */ + {61799, 65, 12}, /* 64 */ + {64851, 66, 11}, /* 65 */ + {68113, 67, 11}, /* 66 */ + {71617, 68, 11}, /* 67 */ + {75401, 69, 10}, /* 68 */ + {79517, 70, 10}, /* 69 */ + {84035, 71, 10}, /* 70 */ + {89053, 72, 10}, /* 71 */ + {94717, 73, 9} /* 72 */ +}; + +static void +sctp_hs_cwnd_increase(struct sctp_tcb *stcb, struct sctp_nets *net) +{ + int cur_val, i, indx, incr; + int old_cwnd = net->cwnd; + + cur_val = net->cwnd >> 10; + indx = SCTP_HS_TABLE_SIZE - 1; + + if (cur_val < sctp_cwnd_adjust[0].cwnd) { + /* normal mode */ + if (net->net_ack > net->mtu) { + net->cwnd += net->mtu; + } else { + net->cwnd += net->net_ack; + } + } else { + for (i = net->last_hs_used; i < SCTP_HS_TABLE_SIZE; i++) { + if (cur_val < sctp_cwnd_adjust[i].cwnd) { + indx = i; + break; + } + } + net->last_hs_used = indx; + incr = ((sctp_cwnd_adjust[indx].increase) << 10); + net->cwnd += incr; + } + sctp_enforce_cwnd_limit(&stcb->asoc, net); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SS); + } +} + +static void +sctp_hs_cwnd_decrease(struct sctp_tcb *stcb, struct sctp_nets *net) +{ + int cur_val, i, indx; + int old_cwnd = net->cwnd; + + cur_val = net->cwnd >> 10; + if (cur_val < sctp_cwnd_adjust[0].cwnd) { + /* normal mode */ + net->ssthresh = net->cwnd / 2; + if (net->ssthresh < (net->mtu * 2)) { + net->ssthresh = 2 * net->mtu; + } + net->cwnd = net->ssthresh; + } else { + /* drop by the proper amount */ + net->ssthresh = net->cwnd - (int)((net->cwnd / 100) * + sctp_cwnd_adjust[net->last_hs_used].drop_percent); + net->cwnd = net->ssthresh; + /* now where are we */ + indx = net->last_hs_used; + cur_val = net->cwnd >> 10; + /* reset where we are in the table */ + if (cur_val < sctp_cwnd_adjust[0].cwnd) { + /* feel out of hs */ + net->last_hs_used = 0; + } else { + for (i = indx; i >= 1; i--) { + if (cur_val > sctp_cwnd_adjust[i - 1].cwnd) { + break; + } + } + net->last_hs_used = indx; + } + } + sctp_enforce_cwnd_limit(&stcb->asoc, net); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_FR); + } +} + +static void +sctp_hs_cwnd_update_after_fr(struct sctp_tcb *stcb, + struct sctp_association *asoc) +{ + struct sctp_nets *net; + /* + * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) && + * (net->fast_retran_loss_recovery == 0))) + */ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + if ((asoc->fast_retran_loss_recovery == 0) || + (asoc->sctp_cmt_on_off > 0)) { + /* out of a RFC2582 Fast recovery window? */ + if (net->net_ack > 0) { + /* + * per section 7.2.3, are there any + * destinations that had a fast retransmit + * to them. If so what we need to do is + * adjust ssthresh and cwnd. + */ + struct sctp_tmit_chunk *lchk; + + sctp_hs_cwnd_decrease(stcb, net); + + lchk = TAILQ_FIRST(&asoc->send_queue); + + net->partial_bytes_acked = 0; + /* Turn on fast recovery window */ + asoc->fast_retran_loss_recovery = 1; + if (lchk == NULL) { + /* Mark end of the window */ + asoc->fast_recovery_tsn = asoc->sending_seq - 1; + } else { + asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; + } + + /* + * CMT fast recovery -- per destination + * recovery variable. + */ + net->fast_retran_loss_recovery = 1; + + if (lchk == NULL) { + /* Mark end of the window */ + net->fast_recovery_tsn = asoc->sending_seq - 1; + } else { + net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; + } + + sctp_timer_stop(SCTP_TIMER_TYPE_SEND, + stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA+SCTP_LOC_32); + sctp_timer_start(SCTP_TIMER_TYPE_SEND, + stcb->sctp_ep, stcb, net); + } + } else if (net->net_ack > 0) { + /* + * Mark a peg that we WOULD have done a cwnd + * reduction but RFC2582 prevented this action. + */ + SCTP_STAT_INCR(sctps_fastretransinrtt); + } + } +} + +static void +sctp_hs_cwnd_update_after_sack(struct sctp_tcb *stcb, + struct sctp_association *asoc, + int accum_moved, int reneged_all SCTP_UNUSED, int will_exit) +{ + struct sctp_nets *net; + /******************************/ + /* update cwnd and Early FR */ + /******************************/ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + +#ifdef JANA_CMT_FAST_RECOVERY + /* + * CMT fast recovery code. Need to debug. + */ + if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) { + if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) || + SCTP_TSN_GE(net->pseudo_cumack,net->fast_recovery_tsn)) { + net->will_exit_fast_recovery = 1; + } + } +#endif + /* if nothing was acked on this destination skip it */ + if (net->net_ack == 0) { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK); + } + continue; + } +#ifdef JANA_CMT_FAST_RECOVERY + /* CMT fast recovery code + */ + /* + if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery && net->will_exit_fast_recovery == 0) { + @@@ Do something + } + else if (sctp_cmt_on_off == 0 && asoc->fast_retran_loss_recovery && will_exit == 0) { + */ +#endif + + if (asoc->fast_retran_loss_recovery && + (will_exit == 0) && + (asoc->sctp_cmt_on_off == 0)) { + /* + * If we are in loss recovery we skip any cwnd + * update + */ + return; + } + /* + * CMT: CUC algorithm. Update cwnd if pseudo-cumack has + * moved. + */ + if (accum_moved || + ((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) { + /* If the cumulative ack moved we can proceed */ + if (net->cwnd <= net->ssthresh) { + /* We are in slow start */ + if (net->flight_size + net->net_ack >= net->cwnd) { + sctp_hs_cwnd_increase(stcb, net); + } else { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, net, net->net_ack, + SCTP_CWND_LOG_NOADV_SS); + } + } + } else { + /* We are in congestion avoidance */ + net->partial_bytes_acked += net->net_ack; + if ((net->flight_size + net->net_ack >= net->cwnd) && + (net->partial_bytes_acked >= net->cwnd)) { + net->partial_bytes_acked -= net->cwnd; + net->cwnd += net->mtu; + sctp_enforce_cwnd_limit(asoc, net); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, net->mtu, + SCTP_CWND_LOG_FROM_CA); + } + } else { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, net, net->net_ack, + SCTP_CWND_LOG_NOADV_CA); + } + } + } + } else { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, net, net->mtu, + SCTP_CWND_LOG_NO_CUMACK); + } + } + } +} + + +/* + * H-TCP congestion control. The algorithm is detailed in: + * R.N.Shorten, D.J.Leith: + * "H-TCP: TCP for high-speed and long-distance networks" + * Proc. PFLDnet, Argonne, 2004. + * http://www.hamilton.ie/net/htcp3.pdf + */ + + +static int use_rtt_scaling = 1; +static int use_bandwidth_switch = 1; + +static inline int +between(uint32_t seq1, uint32_t seq2, uint32_t seq3) +{ + return (seq3 - seq2 >= seq1 - seq2); +} + +static inline uint32_t +htcp_cong_time(struct htcp *ca) +{ + return (sctp_get_tick_count() - ca->last_cong); +} + +static inline uint32_t +htcp_ccount(struct htcp *ca) +{ + return (htcp_cong_time(ca)/ca->minRTT); +} + +static inline void +htcp_reset(struct htcp *ca) +{ + ca->undo_last_cong = ca->last_cong; + ca->undo_maxRTT = ca->maxRTT; + ca->undo_old_maxB = ca->old_maxB; + ca->last_cong = sctp_get_tick_count(); +} + +#ifdef SCTP_NOT_USED + +static uint32_t +htcp_cwnd_undo(struct sctp_tcb *stcb, struct sctp_nets *net) +{ + net->cc_mod.htcp_ca.last_cong = net->cc_mod.htcp_ca.undo_last_cong; + net->cc_mod.htcp_ca.maxRTT = net->cc_mod.htcp_ca.undo_maxRTT; + net->cc_mod.htcp_ca.old_maxB = net->cc_mod.htcp_ca.undo_old_maxB; + return (max(net->cwnd, ((net->ssthresh/net->mtu<<7)/net->cc_mod.htcp_ca.beta)*net->mtu)); +} + +#endif + +static inline void +measure_rtt(struct sctp_nets *net) +{ + uint32_t srtt = net->lastsa>>SCTP_RTT_SHIFT; + + /* keep track of minimum RTT seen so far, minRTT is zero at first */ + if (net->cc_mod.htcp_ca.minRTT > srtt || !net->cc_mod.htcp_ca.minRTT) + net->cc_mod.htcp_ca.minRTT = srtt; + + /* max RTT */ + if (net->fast_retran_ip == 0 && net->ssthresh < 0xFFFF && htcp_ccount(&net->cc_mod.htcp_ca) > 3) { + if (net->cc_mod.htcp_ca.maxRTT < net->cc_mod.htcp_ca.minRTT) + net->cc_mod.htcp_ca.maxRTT = net->cc_mod.htcp_ca.minRTT; + if (net->cc_mod.htcp_ca.maxRTT < srtt && srtt <= net->cc_mod.htcp_ca.maxRTT+MSEC_TO_TICKS(20)) + net->cc_mod.htcp_ca.maxRTT = srtt; + } +} + +static void +measure_achieved_throughput(struct sctp_nets *net) +{ + uint32_t now = sctp_get_tick_count(); + + if (net->fast_retran_ip == 0) + net->cc_mod.htcp_ca.bytes_acked = net->net_ack; + + if (!use_bandwidth_switch) + return; + + /* achieved throughput calculations */ + /* JRS - not 100% sure of this statement */ + if (net->fast_retran_ip == 1) { + net->cc_mod.htcp_ca.bytecount = 0; + net->cc_mod.htcp_ca.lasttime = now; + return; + } + + net->cc_mod.htcp_ca.bytecount += net->net_ack; + if ((net->cc_mod.htcp_ca.bytecount >= net->cwnd - (((net->cc_mod.htcp_ca.alpha >> 7) ? (net->cc_mod.htcp_ca.alpha >> 7) : 1) * net->mtu)) && + (now - net->cc_mod.htcp_ca.lasttime >= net->cc_mod.htcp_ca.minRTT) && + (net->cc_mod.htcp_ca.minRTT > 0)) { + uint32_t cur_Bi = net->cc_mod.htcp_ca.bytecount/net->mtu*hz/(now - net->cc_mod.htcp_ca.lasttime); + + if (htcp_ccount(&net->cc_mod.htcp_ca) <= 3) { + /* just after backoff */ + net->cc_mod.htcp_ca.minB = net->cc_mod.htcp_ca.maxB = net->cc_mod.htcp_ca.Bi = cur_Bi; + } else { + net->cc_mod.htcp_ca.Bi = (3*net->cc_mod.htcp_ca.Bi + cur_Bi)/4; + if (net->cc_mod.htcp_ca.Bi > net->cc_mod.htcp_ca.maxB) + net->cc_mod.htcp_ca.maxB = net->cc_mod.htcp_ca.Bi; + if (net->cc_mod.htcp_ca.minB > net->cc_mod.htcp_ca.maxB) + net->cc_mod.htcp_ca.minB = net->cc_mod.htcp_ca.maxB; + } + net->cc_mod.htcp_ca.bytecount = 0; + net->cc_mod.htcp_ca.lasttime = now; + } +} + +static inline void +htcp_beta_update(struct htcp *ca, uint32_t minRTT, uint32_t maxRTT) +{ + if (use_bandwidth_switch) { + uint32_t maxB = ca->maxB; + uint32_t old_maxB = ca->old_maxB; + ca->old_maxB = ca->maxB; + + if (!between(5*maxB, 4*old_maxB, 6*old_maxB)) { + ca->beta = BETA_MIN; + ca->modeswitch = 0; + return; + } + } + + if (ca->modeswitch && minRTT > (uint32_t)MSEC_TO_TICKS(10) && maxRTT) { + ca->beta = (minRTT<<7)/maxRTT; + if (ca->beta < BETA_MIN) + ca->beta = BETA_MIN; + else if (ca->beta > BETA_MAX) + ca->beta = BETA_MAX; + } else { + ca->beta = BETA_MIN; + ca->modeswitch = 1; + } +} + +static inline void +htcp_alpha_update(struct htcp *ca) +{ + uint32_t minRTT = ca->minRTT; + uint32_t factor = 1; + uint32_t diff = htcp_cong_time(ca); + + if (diff > (uint32_t)hz) { + diff -= hz; + factor = 1+ ( 10*diff + ((diff/2)*(diff/2)/hz))/hz; + } + + if (use_rtt_scaling && minRTT) { + uint32_t scale = (hz<<3)/(10*minRTT); + scale = min(max(scale, 1U<<2), 10U<<3); /* clamping ratio to interval [0.5,10]<<3 */ + factor = (factor<<3)/scale; + if (!factor) + factor = 1; + } + + ca->alpha = 2*factor*((1<<7)-ca->beta); + if (!ca->alpha) + ca->alpha = ALPHA_BASE; +} + +/* After we have the rtt data to calculate beta, we'd still prefer to wait one + * rtt before we adjust our beta to ensure we are working from a consistent + * data. + * + * This function should be called when we hit a congestion event since only at + * that point do we really have a real sense of maxRTT (the queues en route + * were getting just too full now). + */ +static void +htcp_param_update(struct sctp_nets *net) +{ + uint32_t minRTT = net->cc_mod.htcp_ca.minRTT; + uint32_t maxRTT = net->cc_mod.htcp_ca.maxRTT; + + htcp_beta_update(&net->cc_mod.htcp_ca, minRTT, maxRTT); + htcp_alpha_update(&net->cc_mod.htcp_ca); + + /* add slowly fading memory for maxRTT to accommodate routing changes etc */ + if (minRTT > 0 && maxRTT > minRTT) + net->cc_mod.htcp_ca.maxRTT = minRTT + ((maxRTT-minRTT)*95)/100; +} + +static uint32_t +htcp_recalc_ssthresh(struct sctp_nets *net) +{ + htcp_param_update(net); + return (max(((net->cwnd/net->mtu * net->cc_mod.htcp_ca.beta) >> 7)*net->mtu, 2U*net->mtu)); +} + +static void +htcp_cong_avoid(struct sctp_tcb *stcb, struct sctp_nets *net) +{ + /*- + * How to handle these functions? + * if (!tcp_is_cwnd_limited(sk, in_flight)) RRS - good question. + * return; + */ + if (net->cwnd <= net->ssthresh) { + /* We are in slow start */ + if (net->flight_size + net->net_ack >= net->cwnd) { + if (net->net_ack > (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable))) { + net->cwnd += (net->mtu * SCTP_BASE_SYSCTL(sctp_L2_abc_variable)); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, net->mtu, + SCTP_CWND_LOG_FROM_SS); + } + + } else { + net->cwnd += net->net_ack; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, net->net_ack, + SCTP_CWND_LOG_FROM_SS); + } + + } + sctp_enforce_cwnd_limit(&stcb->asoc, net); + } else { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, net, net->net_ack, + SCTP_CWND_LOG_NOADV_SS); + } + } + } else { + measure_rtt(net); + + /* In dangerous area, increase slowly. + * In theory this is net->cwnd += alpha / net->cwnd + */ + /* What is snd_cwnd_cnt?? */ + if (((net->partial_bytes_acked/net->mtu * net->cc_mod.htcp_ca.alpha) >> 7)*net->mtu >= net->cwnd) { + /*- + * Does SCTP have a cwnd clamp? + * if (net->snd_cwnd < net->snd_cwnd_clamp) - Nope (RRS). + */ + net->cwnd += net->mtu; + net->partial_bytes_acked = 0; + sctp_enforce_cwnd_limit(&stcb->asoc, net); + htcp_alpha_update(&net->cc_mod.htcp_ca); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, net->mtu, + SCTP_CWND_LOG_FROM_CA); + } + } else { + net->partial_bytes_acked += net->net_ack; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, net, net->net_ack, + SCTP_CWND_LOG_NOADV_CA); + } + } + + net->cc_mod.htcp_ca.bytes_acked = net->mtu; + } +} + +#ifdef SCTP_NOT_USED +/* Lower bound on congestion window. */ +static uint32_t +htcp_min_cwnd(struct sctp_tcb *stcb, struct sctp_nets *net) +{ + return (net->ssthresh); +} +#endif + +static void +htcp_init(struct sctp_nets *net) +{ + memset(&net->cc_mod.htcp_ca, 0, sizeof(struct htcp)); + net->cc_mod.htcp_ca.alpha = ALPHA_BASE; + net->cc_mod.htcp_ca.beta = BETA_MIN; + net->cc_mod.htcp_ca.bytes_acked = net->mtu; + net->cc_mod.htcp_ca.last_cong = sctp_get_tick_count(); +} + +static void +sctp_htcp_set_initial_cc_param(struct sctp_tcb *stcb, struct sctp_nets *net) +{ + /* + * We take the max of the burst limit times a MTU or the + * INITIAL_CWND. We then limit this to 4 MTU's of sending. + */ + net->cwnd = min((net->mtu * 4), max((2 * net->mtu), SCTP_INITIAL_CWND)); + net->ssthresh = stcb->asoc.peers_rwnd; + sctp_enforce_cwnd_limit(&stcb->asoc, net); + htcp_init(net); + + if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE|SCTP_CWND_LOGGING_ENABLE)) { + sctp_log_cwnd(stcb, net, 0, SCTP_CWND_INITIALIZATION); + } +} + +static void +sctp_htcp_cwnd_update_after_sack(struct sctp_tcb *stcb, + struct sctp_association *asoc, + int accum_moved, int reneged_all SCTP_UNUSED, int will_exit) +{ + struct sctp_nets *net; + + /******************************/ + /* update cwnd and Early FR */ + /******************************/ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + +#ifdef JANA_CMT_FAST_RECOVERY + /* + * CMT fast recovery code. Need to debug. + */ + if (net->fast_retran_loss_recovery && net->new_pseudo_cumack) { + if (SCTP_TSN_GE(asoc->last_acked_seq, net->fast_recovery_tsn) || + SCTP_TSN_GE(net->pseudo_cumack,net->fast_recovery_tsn)) { + net->will_exit_fast_recovery = 1; + } + } +#endif + /* if nothing was acked on this destination skip it */ + if (net->net_ack == 0) { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FROM_SACK); + } + continue; + } +#ifdef JANA_CMT_FAST_RECOVERY + /* CMT fast recovery code + */ + /* + if (sctp_cmt_on_off > 0 && net->fast_retran_loss_recovery && net->will_exit_fast_recovery == 0) { + @@@ Do something + } + else if (sctp_cmt_on_off == 0 && asoc->fast_retran_loss_recovery && will_exit == 0) { + */ +#endif + + if (asoc->fast_retran_loss_recovery && + will_exit == 0 && + (asoc->sctp_cmt_on_off == 0)) { + /* + * If we are in loss recovery we skip any cwnd + * update + */ + return; + } + /* + * CMT: CUC algorithm. Update cwnd if pseudo-cumack has + * moved. + */ + if (accum_moved || + ((asoc->sctp_cmt_on_off > 0) && net->new_pseudo_cumack)) { + htcp_cong_avoid(stcb, net); + measure_achieved_throughput(net); + } else { + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { + sctp_log_cwnd(stcb, net, net->mtu, + SCTP_CWND_LOG_NO_CUMACK); + } + } + } +} + +static void +sctp_htcp_cwnd_update_after_fr(struct sctp_tcb *stcb, + struct sctp_association *asoc) +{ + struct sctp_nets *net; + /* + * CMT fast recovery code. Need to debug. ((sctp_cmt_on_off > 0) && + * (net->fast_retran_loss_recovery == 0))) + */ + TAILQ_FOREACH(net, &asoc->nets, sctp_next) { + if ((asoc->fast_retran_loss_recovery == 0) || + (asoc->sctp_cmt_on_off > 0)) { + /* out of a RFC2582 Fast recovery window? */ + if (net->net_ack > 0) { + /* + * per section 7.2.3, are there any + * destinations that had a fast retransmit + * to them. If so what we need to do is + * adjust ssthresh and cwnd. + */ + struct sctp_tmit_chunk *lchk; + int old_cwnd = net->cwnd; + + /* JRS - reset as if state were changed */ + htcp_reset(&net->cc_mod.htcp_ca); + net->ssthresh = htcp_recalc_ssthresh(net); + net->cwnd = net->ssthresh; + sctp_enforce_cwnd_limit(asoc, net); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), + SCTP_CWND_LOG_FROM_FR); + } + lchk = TAILQ_FIRST(&asoc->send_queue); + + net->partial_bytes_acked = 0; + /* Turn on fast recovery window */ + asoc->fast_retran_loss_recovery = 1; + if (lchk == NULL) { + /* Mark end of the window */ + asoc->fast_recovery_tsn = asoc->sending_seq - 1; + } else { + asoc->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; + } + + /* + * CMT fast recovery -- per destination + * recovery variable. + */ + net->fast_retran_loss_recovery = 1; + + if (lchk == NULL) { + /* Mark end of the window */ + net->fast_recovery_tsn = asoc->sending_seq - 1; + } else { + net->fast_recovery_tsn = lchk->rec.data.TSN_seq - 1; + } + + sctp_timer_stop(SCTP_TIMER_TYPE_SEND, + stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA+SCTP_LOC_32); + sctp_timer_start(SCTP_TIMER_TYPE_SEND, + stcb->sctp_ep, stcb, net); + } + } else if (net->net_ack > 0) { + /* + * Mark a peg that we WOULD have done a cwnd + * reduction but RFC2582 prevented this action. + */ + SCTP_STAT_INCR(sctps_fastretransinrtt); + } + } +} + +static void +sctp_htcp_cwnd_update_after_timeout(struct sctp_tcb *stcb, + struct sctp_nets *net) +{ + int old_cwnd = net->cwnd; + + /* JRS - reset as if the state were being changed to timeout */ + htcp_reset(&net->cc_mod.htcp_ca); + net->ssthresh = htcp_recalc_ssthresh(net); + net->cwnd = net->mtu; + net->partial_bytes_acked = 0; + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX); + } +} + +static void +sctp_htcp_cwnd_update_after_ecn_echo(struct sctp_tcb *stcb, + struct sctp_nets *net, int in_window, int num_pkt_lost SCTP_UNUSED) +{ + int old_cwnd; + old_cwnd = net->cwnd; + + /* JRS - reset hctp as if state changed */ + if (in_window == 0) { + htcp_reset(&net->cc_mod.htcp_ca); + SCTP_STAT_INCR(sctps_ecnereducedcwnd); + net->ssthresh = htcp_recalc_ssthresh(net); + if (net->ssthresh < net->mtu) { + net->ssthresh = net->mtu; + /* here back off the timer as well, to slow us down */ + net->RTO <<= 1; + } + net->cwnd = net->ssthresh; + sctp_enforce_cwnd_limit(&stcb->asoc, net); + if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { + sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); + } + } +} + +struct sctp_cc_functions sctp_cc_functions[] = { +{ +#if defined(__Windows__) || defined(__Userspace_os_Windows) + sctp_set_initial_cc_param, + sctp_cwnd_update_after_sack, + sctp_cwnd_update_exit_pf_common, + sctp_cwnd_update_after_fr, + sctp_cwnd_update_after_timeout, + sctp_cwnd_update_after_ecn_echo, + sctp_cwnd_update_after_packet_dropped, + sctp_cwnd_update_after_output, +#else + .sctp_set_initial_cc_param = sctp_set_initial_cc_param, + .sctp_cwnd_update_after_sack = sctp_cwnd_update_after_sack, + .sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common, + .sctp_cwnd_update_after_fr = sctp_cwnd_update_after_fr, + .sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout, + .sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_after_ecn_echo, + .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped, + .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output, +#endif +}, +{ +#if defined(__Windows__) || defined(__Userspace_os_Windows) + sctp_set_initial_cc_param, + sctp_hs_cwnd_update_after_sack, + sctp_cwnd_update_exit_pf_common, + sctp_hs_cwnd_update_after_fr, + sctp_cwnd_update_after_timeout, + sctp_cwnd_update_after_ecn_echo, + sctp_cwnd_update_after_packet_dropped, + sctp_cwnd_update_after_output, +#else + .sctp_set_initial_cc_param = sctp_set_initial_cc_param, + .sctp_cwnd_update_after_sack = sctp_hs_cwnd_update_after_sack, + .sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common, + .sctp_cwnd_update_after_fr = sctp_hs_cwnd_update_after_fr, + .sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout, + .sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_after_ecn_echo, + .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped, + .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output, +#endif +}, +{ +#if defined(__Windows__) || defined(__Userspace_os_Windows) + sctp_htcp_set_initial_cc_param, + sctp_htcp_cwnd_update_after_sack, + sctp_cwnd_update_exit_pf_common, + sctp_htcp_cwnd_update_after_fr, + sctp_htcp_cwnd_update_after_timeout, + sctp_htcp_cwnd_update_after_ecn_echo, + sctp_cwnd_update_after_packet_dropped, + sctp_cwnd_update_after_output, +#else + .sctp_set_initial_cc_param = sctp_htcp_set_initial_cc_param, + .sctp_cwnd_update_after_sack = sctp_htcp_cwnd_update_after_sack, + .sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common, + .sctp_cwnd_update_after_fr = sctp_htcp_cwnd_update_after_fr, + .sctp_cwnd_update_after_timeout = sctp_htcp_cwnd_update_after_timeout, + .sctp_cwnd_update_after_ecn_echo = sctp_htcp_cwnd_update_after_ecn_echo, + .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped, + .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output, +#endif +}, +{ +#if defined(__Windows__) || defined(__Userspace_os_Windows) + sctp_set_rtcc_initial_cc_param, + sctp_cwnd_update_rtcc_after_sack, + sctp_cwnd_update_exit_pf_common, + sctp_cwnd_update_after_fr, + sctp_cwnd_update_after_timeout, + sctp_cwnd_update_rtcc_after_ecn_echo, + sctp_cwnd_update_after_packet_dropped, + sctp_cwnd_update_after_output, + sctp_cwnd_update_rtcc_packet_transmitted, + sctp_cwnd_update_rtcc_tsn_acknowledged, + sctp_cwnd_new_rtcc_transmission_begins, + sctp_cwnd_prepare_rtcc_net_for_sack, + sctp_cwnd_rtcc_socket_option, + sctp_rtt_rtcc_calculated +#else + .sctp_set_initial_cc_param = sctp_set_rtcc_initial_cc_param, + .sctp_cwnd_update_after_sack = sctp_cwnd_update_rtcc_after_sack, + .sctp_cwnd_update_exit_pf = sctp_cwnd_update_exit_pf_common, + .sctp_cwnd_update_after_fr = sctp_cwnd_update_after_fr, + .sctp_cwnd_update_after_timeout = sctp_cwnd_update_after_timeout, + .sctp_cwnd_update_after_ecn_echo = sctp_cwnd_update_rtcc_after_ecn_echo, + .sctp_cwnd_update_after_packet_dropped = sctp_cwnd_update_after_packet_dropped, + .sctp_cwnd_update_after_output = sctp_cwnd_update_after_output, + .sctp_cwnd_update_packet_transmitted = sctp_cwnd_update_rtcc_packet_transmitted, + .sctp_cwnd_update_tsn_acknowledged = sctp_cwnd_update_rtcc_tsn_acknowledged, + .sctp_cwnd_new_transmission_begins = sctp_cwnd_new_rtcc_transmission_begins, + .sctp_cwnd_prepare_net_for_sack = sctp_cwnd_prepare_rtcc_net_for_sack, + .sctp_cwnd_socket_option = sctp_cwnd_rtcc_socket_option, + .sctp_rtt_calculated = sctp_rtt_rtcc_calculated +#endif +} +}; 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